Only the North Tower (1 WTC) had a direct connection to the hotel, but like spidey said the connection was on the mall concourse level, underneath the plaza. You could access the South Tower via the North Tower and the mall.Here is a map of the concourse level showing the connection.

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I have been wondering about that but have been too embarrassed to ask. I grew up believing the Sears tower had 110 stories however most sources I find say 108.
The Willis Tower's website claims 110 stories.

6 World Trade Center had 8 total floors, starting at the street level.

The problem is that the actual visible building has only 7 visible floors starting at the Plaza Level, but there is an additional lower level on the Concourse Level. While this section is at the same level as the Mall at the World Trade Center, it isn't actually connected to the mall in any way, and instead originally had a direct entrance/exit on Vesey St., as can be seen in these images:
You can see the seven upper floors, and the lower street level doors of 6 WTC.

__________________If it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.

6 World Trade Center had 8 total floors, starting at the street level.

The problem is that the actual visible building has only 7 visible floors starting at the Plaza Level, but there is an additional lower level on the Concourse Level. While this section is at the same level as the Mall at the World Trade Center, it isn't actually connected to the mall in any way, and instead originally had a direct entrance/exit on Vesey St., as can be seen in these images:
You can see the seven upper floors, and the lower street level doors of 6 WTC.

Ok, but I still don't understand why that floor on the concourse level counts as a story for that building, while the other buildings in the original complex with floors on the concourse level don't count as a story.

The page doesn't count the concourse level (which is on street level and is below the plaza level and below the North Tower's floors) as a floor. But if it was counted as a floor, wouldn't that actually make the Twin Towers both 111 stories tall instead of 110 stories?

Most sources say that 3 WTC had 22 stories, but Emporis says that 3 WTC had 22 stories from plaza level and had 2 more stories on the concourse level. So according to Emporis, 3 WTC actually had 24 stories.

So why does a floor on the concourse level for 6 WTC count as a story for that building, but not for the other buildings of the original complex?

Floors, below ground floor typically don't count. If I recall, the WTC towers had a huge sunken pit in which to access elevators. The ground/first floor ringed around the open area. If 6WTC had it's concourse level at street level then it would be counted as a floor.

Floors, below ground floor typically don't count. If I recall, the WTC towers had a huge sunken pit in which to access elevators. The ground/first floor ringed around the open area. If 6WTC had it's concourse level at street level then it would be counted as a floor.

I thought the whole concourse level was on the same level as the street level. The concourse level is extremely confusing.

See, the issue is the Concourse Level was on the same level as the street on the north, south and west sides of the complex.

all of the buildings shared had a floor that was the same level as the concourse, but the concourse wasn't entirely part of them, they each had at least a lobby section on that level was wasn't part of the concourse, even if they were at the same elevation.

1, 2, 4, and 5 all had lobbies that opened into the concourse, but were not part of the concourse. 3 and 6 had floors at the same level as the concourse, but didn't connect to the concourse.

To give you a better idea of the floor count of 4, 5 and 6 WTC from the lobby levels at the street to the top floor I took some pictures of my WTC model and labeled them. Hope this helps you.

4 WTC, 9 floors

5 WTC, 9 floors

6 WTC, 8 floors

__________________If it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.

I thought the whole concourse level was on the same level as the street level. The concourse level is extremely confusing.

Very.

I think it was from certain entrances. The ground sloped I think or designed that way..like Empire Center in Albany. I was there 30 years ago and was little so don't remember that much but remember walking through door (of 2WTC) and then downstairs to access elevator to go to top. I do remember seeing entrances on that level as well and that's where I though the concourse was.

See, the issue is the Concourse Level was on the same level as the street on the north, south and west sides of the complex.

all of the buildings shared had a floor that was the same level as the concourse, but the concourse wasn't entirely part of them, they each had at least a lobby section on that level was wasn't part of the concourse, even if they were at the same elevation.

1, 2, 4, and 5 all had lobbies that opened into the concourse, but were not part of the concourse. 3 and 6 had floors at the same level as the concourse, but didn't connect to the concourse.

To give you a better idea of the floor count of 4, 5 and 6 WTC from the lobby levels at the street to the top floor I took some pictures of my WTC model and labeled them. Hope this helps you.

4 WTC, 9 floors

5 WTC, 9 floors

6 WTC, 8 floors

So the mall was divided into different areas of the original World Trade Center complex? Like 2 areas of the mall were on both the first floors of 4 and 5 WTC and the rest of the mall was under the plaza (which was the concourse area)?